GOS

I wanted to understand how an OS gets loaded into memory at boot time so I wrote an X86 bootloader from scratch.

Development

Gos requires Make >= 3.

Setting Up

You need a crosscompiler to compile the kernel on MacOS, since your default system compiler assumes you are writing code that will run on your hosted operating system. You can install one by running the install_cross_compiler.sh script.

This installs a gcc crosscompiler targeting the x86-64 architecture. Once it completes in potentially a few minutes, the binary will be available at ~/opt/cross/bin as x86_64-elf-gcc.

Running

To compile the bootloader and run it on qemu:

make run

If it goes well, you should see a message saying "X" on the top-left corner of the screen. Pretty cool, huh?